Symptoms

When accessing a synchronization or analyzing the log files, you see an error which contains "411 Length required".

The details in the log should look like this:

<html> 
<head><title>411 Length Required</title></head> 
<body bgcolor="white"> 
<center><h1>411 Length Required</h1></center> 
<hr><center>nginx</center> 
</body> 
</html>
CODE

Cause

This typically happens on when you use a nginx server which does not support the chunked transfer encoding.

Resolution

You should enable chunked transfer encoding for your nginx server or switch to another server which supports this - so far we haven't heard of any problems with apache servers.

There are two ways to enable chunked transfer encoding for your nginx.

Option 1: Update your nginx server

Update your nginx server to a current version. nginx added support for chunked transfer encoding with version 1.3.9 back in 2012. This is also recommended since there have been several security bugfix releases.

Option 2: Install an additional nginx module

Use the chunkin-nginx-module nginx versions prior to 1.3.9. See this documentation for more details.